JPS6017710Y2 - radiation thermometer - Google Patents

Description

[Detailed explanation of the invention] This invention receives radiant energy from the object to be measured,
This invention relates to a radiation thermometer that measures the temperature of a measured object without contact.

Conventionally, a radiation thermometer as shown in FIG. 1 has been used in continuous casting equipment and the like.

In the figure, reference numeral 1 denotes a light guide made of, for example, quartz glass.

2 is a holding cylinder for protecting and supporting the light guide, and 3 is an optical fiber body such as an optical fiber.

4 is a joint that connects the light guide 1 and the optical fiber body 3;
Reference numeral 5 denotes a joint holding cylinder for protecting and strengthening the joint portion 4.

The above-mentioned light guide 1 and up to the coupling and holding cylinder 5 constitute a detection section.

Reference numeral 6 denotes a light receiving section (not shown) connected to the optical fiber body 3.

In the radiation thermometer configured in this way, the light guide 1
The radiant energy incident on the object to be measured is transmitted through the optical fiber body 3 and received by the light receiving section 6, and is converted into an electrical signal output according to the incident energy to measure the temperature of the object to be measured. .

In this conventional example, the bending property of the optical fiber body 3 is utilized to allow the detection section, which is the introducing section for radiant energy, and the light receiving section 6 to be freely arranged at a predetermined distance apart, but the detection section often vibrates. If installed in a bad environment, there is a drawback that the light guide 1 may break due to vibration.

In this case, since the cut surface is not flat and is folded in a complicated manner, the radiant energy is scattered and does not reach the light receiving section 6, making measurement impossible.

Furthermore, it is not easy to replace the light guide 1, and there are many maintenance problems.

The purpose of this invention is to provide a radiation thermometer that is resistant to vibration and eliminates the above-mentioned drawbacks.

An embodiment of this invention will be described below with reference to FIG.

In the figure, numerals 11, 12, 13, and 14 are short rod-shaped light guides with both end faces cut at right angles and the peripheral surfaces thoroughly polished.

Reference numeral 2 denotes a holding cylinder into which the light guides 11, 12, 13, and 14 are inserted, and metal (SUS, brass, etc.) or ceramic is used depending on the purpose, and serves to protect and support the light guides 11 to 14.

3 is an optical fiber body such as an optical fiber.

Reference numeral 4 designates a joint portion that joins the optical fiber body 3 to the light guide 14, and 5 designates a joint holding cylinder for protecting and strengthening the joint portion 4.

The light guide 11 and the coupling and holding cylinder 5 constitute a detection section.

Reference numeral 6 denotes a light receiving section (not shown) connected to the optical fiber body 3.

7 indicates the radiant energy from the object to be measured.

The radiant energy 7 from the object to be measured enters the light guide 11 and is totally reflected on the surface in contact with the holding cylinder 2, and is further totally reflected on the opposite surface, and then the light guide 1 connected to the light guide 11 is completely reflected.
2.

An enlarged view of this transmission mechanism is shown in FIG.

The light guides 11 and 12 are connected in the holding cylinder 2, but when enlarged, there is a slight gap 8 between which the radiant energy 7 is refracted and transmitted to the light guide 12. .

Hereinafter, the radiant energy 7 transmitted while being totally reflected by the light guides 13 and 14 connected to the light guide 12 is transmitted through the junction 4.
It is transmitted to the optical fiber body 3 via.

The radiant energy 7 transmitted through the optical fiber body 3 is transmitted to the light receiving section 6
The temperature of the object to be measured is measured by receiving the light and converting it into an electrical signal output corresponding to the incident energy.

Next, consider the case where the detection unit is installed in a bad environment with a lot of vibration.

The vibrations applied to the holding cylinder 2 affect the light guides 11 to 14, but each of the guide members 11 to 14 is composed of a short rod-shaped body, which has increased strength compared to a long light guide. Furthermore, since there is a slight gap 8 between each of the light guides 11 to 14, vibrations from the outside are absorbed, and a situation where each of the light guides 11 to 14 is broken due to vibration can be avoided. .

As explained in detail above, this invention is a radiation thermometer in which radiant energy from an object to be measured is guided to an optical fiber body through a light guide. This is a radiation thermometer that can be inserted into the inside of the device and arranged in series.

Therefore, even if the light guide is installed in a bad environment with many vibrations, it is not affected by the vibrations and has the effect of avoiding a situation where measurement becomes impossible.

Furthermore, since the light guide is made into a short rod-like body, it has the advantage that it can be easily added to depending on the purpose and the length can be changed freely.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a conventional radiation thermometer, FIG. 2 is a configuration diagram showing an embodiment of this invention, and FIG. 3 is an enlarged view of a transmission mechanism within a light guide. 1.11, 12, 13.14... light guide, 2.
...Holding tube, 3...Optical fiber body, 4...
...Joint part, 5...Joining and holding cylinder, 6...
... Light receiving part, 7... Radiation energy 8...
····gap.

Claims (1)

[Scope of utility model registration request] In a radiation thermometer that performs measurement by guiding radiant energy from an object to be measured to an optical fiber body through a light guide,
The above-mentioned light guide is made up of a plurality of short rod-shaped bodies whose end faces are cut at right angles and sufficiently polished, each of which is inserted into a holding cylinder, and arranged in series with a slight gap between them. A characteristic radiation thermometer.